/*
 *
 * Paros and its related class files.
 * 
 * Paros is an HTTP/HTTPS proxy for assessing web application security.
 * Copyright (C) 2003-2004 Chinotec Technologies Company
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the Clarified Artistic License
 * as published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * Clarified Artistic License for more details.
 * 
 * You should have received a copy of the Clarified Artistic License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package org.parosproxy.paros.extension.filter;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.httpclient.URI;
import org.parosproxy.paros.network.HttpMessage;
import org.parosproxy.paros.network.HttpRequestHeader;

/**
 * 
 * To change the template for this generated type comment go to Window -
 * Preferences - Java - Code Generation - Code and Comments
 */
public class FilterLogGetQuery extends FilterAdaptor {

	private static final String delim = "\t";
	private static final String CRLF = "\r\n";
	private File outFile;
	private Pattern pSeparator = Pattern.compile("([^=&]+)[=]([^=&]*)");
	private Matcher matcher2;
	private BufferedWriter writer = null;
	private long lastWriteTime = System.currentTimeMillis();

	/*
	 * @see com.proofsecure.paros.extension.filter.AbstractFilter#getId()
	 */
	public int getId() {
		return 20;
	}

	/*
	 * @see com.proofsecure.paros.extension.filter.AbstractFilter#getName()
	 */
	public String getName() {
		return "Log unique GET queries into file (" + getLogFileName() + ")";

	}

	public void init() {
		outFile = new File(getLogFileName());

	}

	protected String getLogFileName() {
		return "filter/get.xls";
	}

	/*
	 * @see
	 * com.proofsecure.paros.core.proxy.ProxyListener#onHttpRequestSend(com.
	 * proofsecure.paros.network.HttpMessage)
	 */
	public void onHttpRequestSend(HttpMessage httpMessage) {

		HttpRequestHeader reqHeader = httpMessage.getRequestHeader();

		if (reqHeader != null && reqHeader.isText() && !reqHeader.isImage()) {
			if (reqHeader.getMethod().equalsIgnoreCase(HttpRequestHeader.GET)) {
				try {

					URI uri = reqHeader.getURI();

					String firstline;

					URI newURI = (URI) uri.clone();
					String query = newURI.getQuery();
					if (query != null) {
						newURI.setQuery(null);
						firstline = newURI.toString();
						Hashtable<String, String> param = parseParameter(query);
						writeLogFile(firstline, param);
					} else {
						firstline = uri.toString();
						writeLogFile(firstline, null);
					}

				} catch (Exception aa) {
					aa.printStackTrace();
				}
			}

		}

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * com.proofsecure.paros.core.proxy.ProxyListener#onHttpResponseReceive(
	 * com.proofsecure.paros.network.HttpMessage)
	 */
	public void onHttpResponseReceive(HttpMessage httpMessage) {

	}

	protected synchronized void writeLogFile(String line, Hashtable<String, String> param) {
		// write to default file
		try {

			if (getWriter() != null) {

				getWriter().write(line + CRLF);
			}

			if (param != null) {
				Enumeration<String> v = param.keys();
				while (v.hasMoreElements()) {
					String name = (String) v.nextElement();
					String value = (String) param.get(name);
					getWriter().write(delim + name + delim + value + CRLF);
				}
			}

			lastWriteTime = System.currentTimeMillis();

		} catch (IOException ae) {
		}

	}

	protected Hashtable<String, String> parseParameter(String param) {
		Hashtable<String, String> table = new Hashtable<String, String>();

		try {
			matcher2 = pSeparator.matcher(param);
			while (matcher2.find()) {
				// start of a request
				table.put(matcher2.group(1), matcher2.group(2));

			}
		} catch (Exception e) {
			System.out.println("Error: " + e.getMessage());
		}
		return table;

	}

	public synchronized void timer() {
		// 5s elapse and no more write. close file.
		if (writer != null && System.currentTimeMillis() > lastWriteTime + 5000) {
			try {
				writer.close();
				writer = null;
			} catch (IOException e) {
			}
		}
	}

	private synchronized BufferedWriter getWriter() throws IOException {
		if (writer == null) {
			writer = new BufferedWriter(new FileWriter(outFile, true));
		}
		return writer;
	}

}
